OBJECTIVES: M112 Cutting Tools Use and understand the nomenclature of a cutting-tool point. Explain rake and clearance angles Identify various types of cutting-tool materials.

M112 Cutting Tools CUTTING

Basic Qualities of Tool Materials Strength Hardness Resistance to heat Resistance to shock

Tool Materials Strength Tensile Compressive Transverse Rupture

Tool Materials Hardness Ability to resist penetration

Tool Materials Resistance to Heat High speed steel vs. carbon steel Red Hardness carbides and ceramics vs. high speed steel

Tool Materials Resistance to Shock High heat resistance = Low shock resistance

Cutting Tool Materials Carbon Tool Steels High Speed Steels Carbide Ceramics

Single Point Tools Cutting Edges & Relief Angles Nose Radius Top Face, Flank, and End Face Side & End Cutting Edge Angles Rake Angles

Tool Wear Flank Wear Crater Wear Built-up Edge

Review Q’s What four [4] qualities should a cutting tool material have? In what three [3] ways can the strength of a cutting tool be measured? What is added to steel to create high-speed steel? Why is high-speed steel superior to simple high-carbon steel? Name three [3] common materials used to make cutting tools. What is the purpose of a rake angle on a cutting tool? What is the purpose of side and end clearances on a tool?

Questions?